US3079277A - Damped structure - Google Patents

Damped structure Download PDF

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Publication number
US3079277A
US3079277A US853065A US85306559A US3079277A US 3079277 A US3079277 A US 3079277A US 853065 A US853065 A US 853065A US 85306559 A US85306559 A US 85306559A US 3079277 A US3079277 A US 3079277A
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United States
Prior art keywords
plates
modulus
elasticity
viscoelastic
coating
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Expired - Lifetime
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US853065A
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Giles W Painter
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Lord Manufacturing Co
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Lord Manufacturing Co
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/30—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium with solid or semi-solid material, e.g. pasty masses, as damping medium
    • F16F9/306—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium with solid or semi-solid material, e.g. pasty masses, as damping medium of the constrained layer type, i.e. comprising one or more constrained viscoelastic layers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24132—Structurally defined web or sheet [e.g., overall dimension, etc.] including grain, strips, or filamentary elements in different layers or components parallel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]

Definitions

  • the present invention is intended to reduce the required thickness of the coating of damping material by incorporating in the damping material thin, relatively stiff, or high modulus plates in such quantity that the plates are in at least partial overlapping relation somewhat in the manner of fish scales and are separated from each other by thin layers of the low modulus damping material.
  • the overlapping plates slide relative to each other and the intervening viscoelastic layers are subjected to shear strain thereby increasing the damping action so that effective damping of the structure can be obtained with a coating of damping material of much less over-all thickness.
  • the thickness of the coating required for effective damping is reduced from several times the thickness of the structure to a thickness substantially the same as that of the structure.
  • FIG. 1 is a section through a structure having a coating of damping material and PEG.
  • 2 is a diagrammatic view illustration of the shearing action between two of the overlapping plates embedded in the viscoelastic damping material.
  • the structure subject to vibration is indicated by the reference numeral 1 and the vibration damping coating applied to one surface of the structure is indicated by the reference numeral 2.
  • the structure for example, could be a panel which might be of irregular shape rather than plane as illustrated.
  • Viscoelastic damping materials are well known. See for example British Patent 513,171. Such damping materials are characterized by high mechanical hysteresis or internal friction and by a modulus of elasticity low compared to structural materials.
  • the coating 2 of low modulus viscoelastic material has embedded therein a plurality of high modulus plates 3 which overlap somewhat in the manner of fish scales and which are wet on both sides by the viscoelastic material.
  • the plates may be regularly arranged or randomly distributed so long as there is a substantial area of overlap between adjacent plates.
  • the size of the plates is not critical. The area of the plates should be large compared to the thickness of the individual plates and small compared to the surface to which the coating is applied. Square plates A on a side and thick are a convenient size. Plates of this size or larger are readily distributed in a random fashion in the viscoelastic material which may then be applied with a trowel to the structure, subject to vibration. As the coating is trowelled, the plates tend to assume a position generally parallel to the surface of the coating.
  • a structure having on a surface subject to vibration an adherent coating of a plurality of plates each wet on both sides with viscoelastic damping material of modulus of elasticity low compared to the modulus of elasticity of the structure and arranged in a plurality of layers united to each other and to said surface by the viscoelastic material, the plates in adjacent layers being of modulus of elasticity high compared to the modulus of elasticity of the viscoelastic material and in at least partial overlapping relation to each other and generally parallel to said surface whereby said plates shear the viscoelastic material as said surface vibrates.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vibration Prevention Devices (AREA)
  • Buildings Adapted To Withstand Abnormal External Influences (AREA)
  • Laminated Bodies (AREA)

Description

Feb. 26, 1963 G. w. PAINTER 3,079,277
DAMPED STRUCTURE Filed Nov. 16, 1959 Fl G. 1
FIG. 2
BY M
a i e It has been suggested that the vibration of structures be reduced by coatings of viscoelastic damping material. Because the structures are so much stiffer (have a much higher modulus of elasticity) than the damping materials, effective damping action frequently requires a coating of damping material several times the thickness of the structure.
The present invention is intended to reduce the required thickness of the coating of damping material by incorporating in the damping material thin, relatively stiff, or high modulus plates in such quantity that the plates are in at least partial overlapping relation somewhat in the manner of fish scales and are separated from each other by thin layers of the low modulus damping material. As the structure is bent, the overlapping plates slide relative to each other and the intervening viscoelastic layers are subjected to shear strain thereby increasing the damping action so that effective damping of the structure can be obtained with a coating of damping material of much less over-all thickness. In many cases, the thickness of the coating required for effective damping is reduced from several times the thickness of the structure to a thickness substantially the same as that of the structure.
In the drawing, FIG. 1 is a section through a structure having a coating of damping material and PEG. 2 is a diagrammatic view illustration of the shearing action between two of the overlapping plates embedded in the viscoelastic damping material.
In the drawing, the structure subject to vibration is indicated by the reference numeral 1 and the vibration damping coating applied to one surface of the structure is indicated by the reference numeral 2. The structure, for example, could be a panel which might be of irregular shape rather than plane as illustrated. Viscoelastic damping materials are well known. See for example British Patent 513,171. Such damping materials are characterized by high mechanical hysteresis or internal friction and by a modulus of elasticity low compared to structural materials.
The coating 2 of low modulus viscoelastic material has embedded therein a plurality of high modulus plates 3 which overlap somewhat in the manner of fish scales and which are wet on both sides by the viscoelastic material. The plates may be regularly arranged or randomly distributed so long as there is a substantial area of overlap between adjacent plates. The size of the plates is not critical. The area of the plates should be large compared to the thickness of the individual plates and small compared to the surface to which the coating is applied. Square plates A on a side and thick are a convenient size. Plates of this size or larger are readily distributed in a random fashion in the viscoelastic material which may then be applied with a trowel to the structure, subject to vibration. As the coating is trowelled, the plates tend to assume a position generally parallel to the surface of the coating.
ice
As the structure 1 is deflected, a tension stress is developed on one side of the neutral axis while a compression stress is developed on the opposite side of the neutral axis. This results in relative sidewise movement between adjacent plates as indicated in FIG. 2 subjecting the intervening layer of viscoelastic material to a shear strain. Since the viscoelastic layer between adjacent plates is very thin, a relatively small movement between adjacent plates results in a substantial shear strain in the viscoelastic material which produces the damping. Since the plates are dispersed throughout the coating, the damping action takes place throughout the entire thickness with the result that the coating may be much thinner than as though the plates were omitted. Satisfactory damping can be obtained with the coating of substantially the same thickness as the structure. If the plates were omitted, the coating would have to be several times the thickness of the structure in order to have the same damping.
What is claimed as new is:
1. A structure having on a surface subject to vibration an adherent coating of viscoelastic damping material of modulus of elasticity low compared to the modulus of elasticity of the structure having embedded therein a plurality of plates of modulus of elasticity high compared to the modulus of elasticity of the viscoelastic material and of area small compared to said surface and with adjacent plates in at least partial overlapping relation to each other and separated from each other by intermediate adherent layers of viscoelastic material, said plates being oriented generally parallel to said surface so as to shear the intermediate layers as said surface vibrates.
2. A structure having on a surface subject to vibration an adherent coating of a plurality of plates each wet on both sides with viscoelastic damping material of modulus of elasticity low compared to the modulus of elasticity of the structure and arranged in a plurality of layers united to each other and to said surface by the viscoelastic material, the plates in adjacent layers being of modulus of elasticity high compared to the modulus of elasticity of the viscoelastic material and in at least partial overlapping relation to each other and generally parallel to said surface whereby said plates shear the viscoelastic material as said surface vibrates.
3. A structure having on a surface subject to vibration an adherent coating of viscoelastic damping material of modulus of elasticity low compared to the modulus of elasticity of the structure having embedded therein multiple layers of a plurality of plates of modulus of elasticity high compared to the modulus of elasticity of the viscoelastic material and of area small compared to said surface and with adjacent plates in at least partial overlapping relation to each other in the manner of fish scales and separated from each other by intermediate adherent layers of viscoelastic material.
References Cited in the file of this patent UNITED STATES PATENTS 2,562,004 Watson et al. July 24, 1951 2,568,004 Heyman Sept. 18, 1951 2,575,733 Schulman et al. Nov. 20, 1951 2,704,105 Robinson et al. Mar. 15, 1955

Claims (1)

1. A STRUCTURE HAVING ON A SURFACE SUBJECT TO VIBRATION AN ADHERENT COATING OF VISCOELASTIC DAMPING MATERIAL OF MODULUS OF ELASTICITY LOW COMPARED TO THE MODULUS OF ELASTICITY OF THE STRUCTURE HAVING EMBEDDED THEREIN A PLURALITY OF PLATES OF MODULUS OF ELASTICITY HIGH COMPARED TO THE MODULUS OF ELASTICITY OF THE VISCOELASTIC MATERIAL AND OF AREA SMALL COMPARED TO SAID SURFACE AND WITH ADJACENT PLATES IN AT LEAST PARTIAL OVERLAPPING RELATION TO EACH OTHER AND SEPARATED FROM EACH OTHER BY INTERMEDIATE ADHERENT LAYERS OF VISCOELASTIC MATERIAL, SAID PLATES BEING ORIENTED GENERALLY PARALLEL TO SAID SURFACE SO AS TO SHEAR THE INTERMEDIATE LAYERS AS SAID SURFACE VIBRATES.
US853065A 1959-11-16 1959-11-16 Damped structure Expired - Lifetime US3079277A (en)

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Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3193236A (en) * 1962-02-12 1965-07-06 Lord Mfg Co Damped chassis
US3249178A (en) * 1959-11-05 1966-05-03 Bolt Beranek & Newman High acoustic transmission loss panel
US3253947A (en) * 1961-03-03 1966-05-31 Porter Co Inc H K Flexible sound attenuating material
US3271188A (en) * 1959-09-11 1966-09-06 Hoechst Ag Vibration damping polymer mixture on metal plate
US3416783A (en) * 1965-11-19 1968-12-17 Firgat S N C Rubber-metal spring device
US3454687A (en) * 1961-07-24 1969-07-08 Ovid P Ciofani Method of making a reflective flexible screen
US3456939A (en) * 1965-07-01 1969-07-22 Ressorts Du Nord Sa Damper and its applications in particular in vehicle suspension springs
US3459463A (en) * 1967-08-29 1969-08-05 Tenney Eng Inc Boundary seal for test chambers using a vibrator
US3857457A (en) * 1973-12-11 1974-12-31 R Fox Device for inhibiting vibratory roof noise
US4168819A (en) * 1976-06-29 1979-09-25 Societe Nationale Des Poudres Et Explosifs Antivibratory and anti-shock device for attachment of a seat shell for vehicles and vibrating platforms
US4198078A (en) * 1978-07-17 1980-04-15 Aeroquip Corporation Pressurized vibration isolator
US4278726A (en) * 1978-09-28 1981-07-14 N. V. Bekaert S.A. Energy absorbing elements comprising rigid non-elastomeric layer and visco-elastic layer with twisted fiber bundles embedded therein
US4635882A (en) * 1980-11-14 1987-01-13 The Boeing Company Method and apparatus for reducing low to mid frequency interior noise
US4828202A (en) * 1979-09-27 1989-05-09 The Boeing Company Method and apparatus for wideband vibration damping of reinforced skin structures
US5203435A (en) * 1990-08-31 1993-04-20 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Composite passive damping struts for large precision structures
WO1998014368A2 (en) * 1996-10-02 1998-04-09 Mcdonnell Douglas Corporation Low frequency noise suppression system
US6209842B1 (en) 1998-05-27 2001-04-03 International Business Machines Corporation Laminated damping device for a carrier
US6361643B2 (en) * 1994-11-23 2002-03-26 Henkel Teroson Gmbh Method for reducing mechanical vibration in metal constructions
US6510701B2 (en) * 2000-08-22 2003-01-28 Denso Corporation Expansion valve with vibration-proof member
US20070151194A1 (en) * 2005-12-30 2007-07-05 Tracy Livingston Lifting system and apparatus for constructing wind turbine towers
US20080080946A1 (en) * 2006-10-02 2008-04-03 Tracy Livingston Expansion pin system for a wind turbine structural tower
US20080078128A1 (en) * 2006-10-02 2008-04-03 Tracy Livingston Lifting system and apparatus for constructing and enclosing wind turbine towers
US20080078083A1 (en) * 2006-10-02 2008-04-03 Tracy Livingston Drive pin system for a wind turbine structural tower
US20090294219A1 (en) * 2008-05-30 2009-12-03 David Oliphant Wind tower service lift
US20100226785A1 (en) * 2005-05-13 2010-09-09 Wind Tower Systems, Llc Structural tower
US20100242406A1 (en) * 2008-12-15 2010-09-30 Wind Tower Systems, Llc Structural shape for wind tower members
US8061478B2 (en) 2008-05-06 2011-11-22 Moderco Inc. Acoustic face of polymer and embedded coarse aggregates and an acoustic panel assembly

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2562004A (en) * 1950-06-20 1951-07-24 Westinghouse Electric Corp Flexible mica insulation
US2568004A (en) * 1950-02-13 1951-09-18 Integrated Mica Corp Method of applying protective coatings of mica to solid surfaces
US2575733A (en) * 1946-12-07 1951-11-20 Westinghouse Electric Corp Flexible mica compositions
US2704105A (en) * 1952-04-03 1955-03-15 Sprague Electric Co Dielectric materials

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2575733A (en) * 1946-12-07 1951-11-20 Westinghouse Electric Corp Flexible mica compositions
US2568004A (en) * 1950-02-13 1951-09-18 Integrated Mica Corp Method of applying protective coatings of mica to solid surfaces
US2562004A (en) * 1950-06-20 1951-07-24 Westinghouse Electric Corp Flexible mica insulation
US2704105A (en) * 1952-04-03 1955-03-15 Sprague Electric Co Dielectric materials

Cited By (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3271188A (en) * 1959-09-11 1966-09-06 Hoechst Ag Vibration damping polymer mixture on metal plate
US3249178A (en) * 1959-11-05 1966-05-03 Bolt Beranek & Newman High acoustic transmission loss panel
US3253947A (en) * 1961-03-03 1966-05-31 Porter Co Inc H K Flexible sound attenuating material
US3454687A (en) * 1961-07-24 1969-07-08 Ovid P Ciofani Method of making a reflective flexible screen
US3193236A (en) * 1962-02-12 1965-07-06 Lord Mfg Co Damped chassis
US3456939A (en) * 1965-07-01 1969-07-22 Ressorts Du Nord Sa Damper and its applications in particular in vehicle suspension springs
US3416783A (en) * 1965-11-19 1968-12-17 Firgat S N C Rubber-metal spring device
US3459463A (en) * 1967-08-29 1969-08-05 Tenney Eng Inc Boundary seal for test chambers using a vibrator
US3857457A (en) * 1973-12-11 1974-12-31 R Fox Device for inhibiting vibratory roof noise
US4168819A (en) * 1976-06-29 1979-09-25 Societe Nationale Des Poudres Et Explosifs Antivibratory and anti-shock device for attachment of a seat shell for vehicles and vibrating platforms
US4198078A (en) * 1978-07-17 1980-04-15 Aeroquip Corporation Pressurized vibration isolator
US4278726A (en) * 1978-09-28 1981-07-14 N. V. Bekaert S.A. Energy absorbing elements comprising rigid non-elastomeric layer and visco-elastic layer with twisted fiber bundles embedded therein
US4828202A (en) * 1979-09-27 1989-05-09 The Boeing Company Method and apparatus for wideband vibration damping of reinforced skin structures
US4635882A (en) * 1980-11-14 1987-01-13 The Boeing Company Method and apparatus for reducing low to mid frequency interior noise
US5203435A (en) * 1990-08-31 1993-04-20 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Composite passive damping struts for large precision structures
US6361643B2 (en) * 1994-11-23 2002-03-26 Henkel Teroson Gmbh Method for reducing mechanical vibration in metal constructions
WO1998014368A3 (en) * 1996-10-02 1998-07-09 Mc Donnell Douglas Corp Low frequency noise suppression system
US5895013A (en) * 1996-10-02 1999-04-20 Mcdonnell Douglas Corp. Low frequency noise suppression system
WO1998014368A2 (en) * 1996-10-02 1998-04-09 Mcdonnell Douglas Corporation Low frequency noise suppression system
US6209842B1 (en) 1998-05-27 2001-04-03 International Business Machines Corporation Laminated damping device for a carrier
US6371433B2 (en) 1998-05-27 2002-04-16 International Business Machines Corporation Laminated damping device for a carrier and a method for making the same
US6510701B2 (en) * 2000-08-22 2003-01-28 Denso Corporation Expansion valve with vibration-proof member
US20100226785A1 (en) * 2005-05-13 2010-09-09 Wind Tower Systems, Llc Structural tower
US20070151194A1 (en) * 2005-12-30 2007-07-05 Tracy Livingston Lifting system and apparatus for constructing wind turbine towers
US7877934B2 (en) 2005-12-30 2011-02-01 Wind Tower Systems, Llc Lifting system and apparatus for constructing wind turbine towers
US20080078083A1 (en) * 2006-10-02 2008-04-03 Tracy Livingston Drive pin system for a wind turbine structural tower
US20080078128A1 (en) * 2006-10-02 2008-04-03 Tracy Livingston Lifting system and apparatus for constructing and enclosing wind turbine towers
US20100236161A1 (en) * 2006-10-02 2010-09-23 Wind Tower Systems, Llc Lifting system and apparatus for constructing and enclosing wind turbine towers
US20080080946A1 (en) * 2006-10-02 2008-04-03 Tracy Livingston Expansion pin system for a wind turbine structural tower
US8069634B2 (en) 2006-10-02 2011-12-06 General Electric Company Lifting system and apparatus for constructing and enclosing wind turbine towers
US8061478B2 (en) 2008-05-06 2011-11-22 Moderco Inc. Acoustic face of polymer and embedded coarse aggregates and an acoustic panel assembly
US20090294219A1 (en) * 2008-05-30 2009-12-03 David Oliphant Wind tower service lift
US8016268B2 (en) 2008-05-30 2011-09-13 Wind Tower Systems, Llc Wind tower service lift
US20100242406A1 (en) * 2008-12-15 2010-09-30 Wind Tower Systems, Llc Structural shape for wind tower members
US8910446B2 (en) 2008-12-15 2014-12-16 Ge Wind Energy, Llc Structural shape for wind tower members

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